YouTube - Satellite Power-Saving by on-board tracking

A video on YouTube shows how a microcontroller could be used on an Amateur Satellite to conserve power when over certain areas of the world.

The YouTube description says

This video illustrates how a small satellite or cubesat could employ an on-board micro-controller to track its own location in real time in order to change its mode or transmit power based on the region of the earth over which it is passing.

Watch On-board Satellite Mode-switching Through Self-Tracking